It works well to keep the tea hot, so I thought I would knit a matching cosy for my teacup.
Here is the bare cup.

I measured up, and cast on. Then ripped, and cast on. Then ripped again, and cast on. And again. You see, I had decided to use the stitch pattern from Stacey in her My So Called Scarf. What I didn't realise was that it drew in the gauge a lot. I mean, A LOT!
I got it in the end. It used almost the same number of stitches as the tea-cosy, and the cup was a much smaller diameter.
It's interesting how that same yarn used for the tea-cosy looks quite different in this stitch pattern, which gives a dense, compact texture, just right for insulation.

The casting off (bind off) only took two attempts to get it right. I needed the shape to curve a little to fit snugly under the bottom curve of the cup. I got that by modifying the last row and not doing the "make 1 " stitch which is an integral part of the stitch pattern. This halved the number of stitches. I then cast off fairly loosely.


I decided against buttons, as I figured they might get in the way. I've used a bit of hat elastic to hold the cosy closed above and below the handle. The elastic allows the cosy to be easily removed for washing.
And, the cosy works! It definitely keeps my tea warmer than a bare cup.